Telegraph printer



Nov. 11\ 193s. J. w. LONG ET AL 2,134,722 TELEGRAPH PRINTER Filed July 31, 1955 13 Sheets-Sheet 1 INVENTORS J.W. LONG BY E.R.WHEELER Y J A ORNEY Nov.. 1, 1938.

\ J. w.Lo G :1- AL 2,134,722

TELEGRAPH PRINTER Filed July 51, 1935 l3 Sheets-Sheet 2 INVENTORS J.W LONG E.R.WHEELER A ORNEY Nov. 1, 1938. J. w. LONG ET AL 2,134,722

TELEGRAPH) PRI NTER F iled Jul y 31, 1935 4 a sheets-shet 3 HIII INVENTORS I J.W.LQNG ERWHEELER --A I RNEYi Nov. 1, 1938. J. w: LONG ET-AL. 2,134,722

' TELEGRAPH PRIMER Filed July 31, 1935 13 Sheets-Sheet 4 m qll llllllh...

INVENTOR$ J.W. LONG E.R.WHEELERI A YAORNEY FIG; 29 m 478 Nov. 1; 1938.

- J. w. LONG T AL TELEGRAPH PRINTER,

Filed July 51, 1935 15 Shee ts-Sheet 5 RNEY INVENTORS J W LONG ENRLWHEELER Nov. 1, 1938. J. wLQNG ET AL 2,134,722

TELEGRAPH PRINTER l3 Sheets-Sheet 6 Filed July 31, 1935 h www g Nov. 1, 1938. J. w. LONG ET AL TELEGRAPH PRINTER l3 Sheets-Sheet '7 Filed July 51, 1935 INVENTORS J .W. LON G E. R.WHEELER Sn Iv g N1- nhm 1 Nov. 1, 1938. J. w. LONG ET AL TELEGRAPH PRINTER 15 Sheets-Sheet 8 'Filed July 51.

INVENTOR @kNN J.W. LONG E.R.WHEELER A QRNEY \N MEN NOV. 1, 1938. l w N L 2,134,722

TELEGRAPH PRINTER Filed July 31, 1935 l3 Sheets-Sheet 9 i Fla-2a W 501 501 W i 1 I TI f 231 Z9 J85 43a 7 J22 I v24 INVENTORS j J.W.LONG 52 i BY E.R.WHEELER.

' A ORNEY Nov. 1, 1938. 5 AL 2,134,722

TELEGRAPH PRINTER J. W. LONG 13 Shets-Sheet 10 Filed July 31. 1935 INVENTORS J W LONG ERWHEELER A'FGRNEY Nov. 1, 193's.

J. W. LONG ET AL TELEGRAPH PRINTER Filed July 31, 1935 l3 Sheets-Sheet ll J. W. LONG ET AL TELEGRAPH PRINTER Filed July 31, 1935 13 Sheets-Sheet l3 INVENTORS J.W.LONG BY E.R.WHEELER asserts TELEGRAPH James W. Long and. Evan. ll... Wheeler, Plainfield, N. ll... assignors to The Western Union Telegraph Company, New Yorh, N. "ill, a corporation off New ilorh Application duly 3i. E935, Serial No. Mfidil iii Claims.

this invention relates to signalling systems and apparatus"- therefor and more particularly to transmitting, selecting, and printing mechame. a keyboard controlled mechanism to selectively transmit signal code characters. The selector mechanism comprises an electroresponsive selector magnet which, in combination with a rotatable selector cam sleeve functions to variably control the operation of the remainder of the selector mechanism. The armature oi the selector magnet is light, yet rigid and has a small amount oi work to perform. It acts with'res'pect to the selective mechanism to only control the selection,

local power being furnished for moving the elements of the selector mechanism. Thus the se lector mechanism is adapted for rapid and accurate selections. The printing mechanism re lates to printing telegraph receiving printers oi the class commonly referred to as page printers. The printer is designed for rapid printing and transmission of news and messagesand a plurality of printers may be interconnected in an intercommunication system for alternatesending and receiving. v

In accordance with the preferred form of the invention there is provided a. receiving printer having a paper feed mechanism and a type carrylng mechanism comprising a type wheel which isarranged to be moved transversely of the paper and rotatable to a selected position by means controlled by the selector mechanism. A keyboard is also provided to control, by means of permutation or selecting bars, an associated transmitter mechanism for transmitting to the selecting mag-- net of its associated printer or distant printers,

the selection corresponding to the actuated key lever in the keyboard. The signalling code employed in with the selector mechanism to transmit characters is known as the "start-stop five unit code.

; If. a given unito! time be divided into five intervals during each of which current may or may not be transmitted, it is possible to produce thirtytwo different combinations of current and nocurrent intervals. Each character is composed of a start impulse followed by live selecting impulses'used in various combinations of current and no-current and a'stop impulse. The start and stop impulses are used to maintain synchronism between the several printers on the circuit.-

- impulses which operatethe selector magnets are 'known-as'marklng impulses and are therefore in- T tervals'oi' current. Im'pulseswhich do not oper- J5 ate the, selector magnets are spacing impulses.

mic transmitting mechanism relates to space signal character is received by the printer,

the same signals that operate a printer of the conjunction L (@l. Wh -2h) The start iulse is ereiore a spacing impulse and the stop impulse a marking impulse.

One or the principal objects of this invention is to provide a page printer with novel selecting, printing and type positioning mechanisms of im- 5 proved efficiency and durability.

Another object of this invention is to provide means whereby after the type carrier has reached the end or a predetermined length of line and a 10 or a predetermined number of characters have been printed after said predetermined length of line is reached, none of said signals being a space signal character, the type carrier will be automatically returned to its initial start position. This precludes the harmful consequence that would result to the printer due to the failure to transmit a reset slgnalat the end of each line. This permits the operation of the page printer on tape printer class. Due to its light construction and speed of operation the type carrier is capable oi heing returned to its start position in a time v interval equal to the time required to transmit one combination of character impulses.

Y A still further object of the invention is the design of the parts of a printer whereby such parts may be easily and cheaply manuiactured and thus reduce the manufacturing and maintenance costs of the printer to a. minimum.

Another still further object of the invention is the design of a typewheel'stop and page mechanisms wherebythey may be readily adapted for use with a multiplex selecting unit.

These and other objects efiected by this invention will be apparent from the following description and claims.

In order that high speed operation may be obtained an overlap arrangement has been provided using two sets of selectors, the first or primary n set being controlled by incoming linesignals by means of a selector magnet and associated equipment and a second set being controlled byother first set. The two sets of selectors are so arranged 1 that the selection of the first set is transferred in a very short interval of time to the second set and the first set thereafter restored to the normal position whereupon it is free to operate in response to the succeeding character code while the second set has nearly the entire interval of one character to operatethe character selecting and printing mechanisms.

"i The individual sub-combinations of: mechanisms that perform the relatedfunctions of the complete mechanism are arrangcdin units which may be easily and readily removed and interchangeably replaced when requiring repairs or adjustments. Thus the replacement of the whole printer is not necessary.

The left end of the printer comprises an upright frame unit casting upon which are mounted the selector and typewheel stop mechanisms. In the framework are also journalled part of the various drive and operating shafts of the printer.

The upright frame unit is mounted on a base plate, the right end of which comprises an upright plate which serves as journal points for the right ends of the shafts of the page operating mechanisms and mounting points for the various other mechanisms. On the rear of the base plate is mounted an electric motor which furnishes power for the various operations and functions through appropriate gearing and clutch mechanisms. The base plate with its attached mechanism is removably mounted on top of a keyboard housing. Locating pins and holes in,the respective units locate the relative position of the units properly. The keyboard is similar to that of an ordinary typewriter and is to the front of the printer. The key levers actuate associated permutation bars in the keyboard housing which control a transmitting mechanism. The transmitting mechanism is mounted on the top of the keyboard housing and serves to transfer the mechanical selections of the permutation or selector bars into corresponding electrical impulses.

The electrical impulses are transferred to an out-going circuit and to the selector magnet of the selector unit of the associated printer. The selector magnet in conjunction with the selector cam sleeve controls the selection of a primary' set of selectors and the release of an operating cam. The primary set of selectors control the selection of a secondary set of selectors which in turn control the positions of the associated code discs of the stop unit. The stop unit serves to stop the type wheel in a position so that the character corresponding to the selected character is in printing relation with the print hammer. The operating cam controls the release of the page operating cam shaft, which in turn controls the transverse movement of the type wheel, the printing and the paper feeding. Various other minor functions and operations are coordinated with the main operations with the proper timing relationship and a complete description will be given hereinafter in connection with the accompanying drawings forming a part of this application in which:

Figure l is a perspective view of a printer embodying the present invention, with a silencing cover thereon;

Figure 2 is a plan view of the printer, with parts broken away, in which the front of the machine is shown at the bottom of the drawings;

Figure 3 is a front elevational view thereof;

Figure 4 is a left end elevational view thereof;

Figure 5 is a sectional view taken on line 5-5 of Figure 4 Figure 6 is a right end elevational view theref;

Figure 7 is a sectional view taken on line 'l! of Figure 2;

Figure 8 is a sectional view taken on line 8-8 of Figure 7, showing a safety device with the printer at rest;

' Figure 8A isa sectional view taken on line 88 printer in operation;

Figure 9 is a fragmentarysectional view taken on line 9-9 of Figure 2;

Figure 10 is a fragmentary sectional view taken on line I 0l0 of Figure 9;

Figure 11 is a plan view of the mechanism shown in Figure 10;

Figure 12 is a fragmentary sectional view taken on line l2-l2 of Figure 2;

Figure 13 is a fragmentary sectional view taken on line l3|3 of Figure 12;

Figure 14 is a fragmentary sectional view taken on line [4-14 of Figure 12;

Figure 15 is a sectional view of the type wheel shaft and stop mechanism taken on line I 5|5 of Figures 2 and 4;

Figure 16 is an enlarged detail sectional view taken on line I 6-46 of Figure 15;

Figure 17 is a plane view of the keyboard mechanism with a part of the keyboard housing broken away;

Figure 18 is an enlarged detail view of the right end of the page operating mechanisms;

Figures 19, 20 and 21 are views of the page oper ating mechanism shown in different operating positions.

Figure 22 is a section on line 22-22 of Figures 2 and 12 I Figure 23 is a fragmentary perspective view of reset and space stop members and following mechanisms controlled thereby;

Figure 24 is a sectional view taken on line 2424 of Figure 12;

Figure 25 is a sectional view taken on line 25-25 of Figure 12;

Figure 26 is a sectional view taken on line 26-26 of Figure '7;

Figure 27 is a sectional view taken on line 21-21 of Figure 26;

Figure 28 is a circuit diagram showing electrical connections between the various elementsof the printer;

Figure 29 is a sectional view taken on line 2929 of Figure 4; and

Figure 30 shows diagrammatically, a developed View of the page mechanism operating cams.

Selecting mechanism Referring first to Figs. 3 and 4; the keyboard base or housing 3| has attached to its top, by screws 32, a casting comprising a horizontal plate portion 33 forming the printer base and, on the right end thereof, a vertical plate portion 34. The base 33 provides mounting points for the various parts and mechanisms of the printer as will be described hereinafter. The end plate 34 provides journals and mounting points for a part of the page operating mechanisms. On the left end of the base plate 33 is mounted, by screws 30-, a left end frame casting comprising two vertical members 35 and .35 extending toward the front of the printer and suitable connecting members therefor. These vertical members and their connecting members provide journals and mounting points for the'selecting and stop unit mechanisms and various other associated mechanisms.

Referring to Figs. 2, 3 and 7, a selector magnet, comprising two electromagnets 36, is mounted on magnet base 31 by screws 38. The purpose of the magnet base 31 is to provide a path for the magnetic circuit when the electromagnets 36 are energized. The magnet base 31 is attached to the selector magnet mounting bracket 39 by means of screws 4|. The bracket 39 is mounted on the upper part of the left and casting plate 35 by screws 42 and 42' (Fig. 7).

screw 52. l

the relative tension of spring aware An armature'pivot rod 63, best shown in Fig. 7, is located in the bracket 39, and pivotally mounted on the rod M is a U-shaped armature lever M.

The armature d5 of the selector magnet 3% is rigidly attached tothe pivoted end of the armature lever it. The stroke of the armature is governed. by the adjustment of the stud M and the self-locking-nut tl thereon in operative relation. with the armature. I

A spring tension indicator lever til pivotally mounted on a forward extension of the bracket 39 by pin" 49 has on it a horizontal projection 58 which engages the upper end of an adjusting A retractile spring 53 has one end attached to the lever 48 and the other end attached adjacentthe end of the armature lever4 l. The spring 53 returns the. armature and armature lever to the unoperated position when the selector magnet it is not energized. The tension of the spring 5% is varied by the position of the spring indicator lever it, as determined by the adju'sting screw'tll. This screw 52 is carried by a horizontal projection 5d of the bracket 39. By changing the adjustment of screwtt the time and speed to which the armature and armature lever respond to line impulses in the selector magnet it are varied. The greater the tension on spring 53 the longer it will take the lever to be positioned by the selector magnet 36,

when the selector magnet is energized. Also the greater the tension exerted by the springbt the quicker the armature will be returned to its backstop when the selector magnet is deenergized.

The etchings 55 on the bracket 39 serve to indicate An operating cam shaft 5%, best shown in Figs.

7 and 9, extends horizontally toward the front The shaft 56 is journaled in tion by the bushing clamping members fit and til attached by screws 59 and 59' to cross members 6t! and ht, respectively, extending between the side the loose hub .l spective members 63 and are ratchet teeth engageable plates" at and 35'. Attached to the shafttt for rotation therewith is a collar ti and. two flanged gear hubs G2 and 63; These members are attached to the shaft by pin Sit and screws 6% and B5, respectively. 'A'hub 66 loosely mounted on the shaft 56 has attached to it by screws 61 for rotation therewith an operating cam hub Bil. Attached to the cam hub 68 by screws 6% (Fig. 10), for rotation therewith is an operating earn it. A spacing sleeve 12 (Fig. 9) on the shaft between 66 and the rigidly attached hub 63 keepsthe operating cam 1! on the hub 66 proper y aligned with its associated parts. A sleeve member 13 slidably mounted on the sleeve 12 is operatively connected to the hub 66 by means of interengaging tooth members 1|] (Fig. '1). The sleeve inember 13 comprises the sliding element of a ratchet clutch by means ofwhich the independently rotatable cam 1| is rotated.

0n the'right face of a sleeve member 13 (Fig. 9)

on the left face of hub 63. These teeth are normally disengaged by means which will be here inafter described. 'A coil spring" surrounding the hub tends to bring the teeth 8!! on the re- 13 into engagement.

* The function and operation of thecam and ratchet clutch will be described in detail later. Respectively attached to hubs 62 and 63 by screws 11 and .18 are gears 15 and 16 for rotation therewith.

A motor M (Figs. 2; 3 and 4) attached to a motor base 19 by screws for the various operations of the printer. The

transversely journaled with a selector cam shaft gear armature and armature with similar teeth action of the 'power end of the stop arm 8|, supplies local power motor base it is mounted on bosses 82 of the printer base til by screws 83. A pinion at attached to the motor shaft meshes with gear 15 (Figs. "Z and 9) fixed on shaft fixed on shaft tit meshes with gear 85 fixed to hub M, (Fig. 12) by screws ill. Hub til is attached by means of pin til to an operating countershaft ht for rotation therewith. The countershaft at is in flanged bushings ti, which in turn are held in the vertical plates of the left end frame 3'5 by bushingclamping members 90, shown dotted in Fig. 9. Fixed by screw at (Fig. 12 to the left endof shaft 8% for rotation therewith is a hub 93 which carries gear lit by means of screws t5. Referring to Fig. 4, gear tit meshes with an idler gear 96, which in turn meshes at. idler gear at is carried by hub Gilli which is rotatably mounted on a stud tilt in the frame member 35. Gear 91! iscarried bye. hub as, (Fig. 12) rotatably mountedon a selector cam shaft til.

The selector cam shaft M is transversely journaled in flanged bushings till and lili which are held by the bushing clamping members W2 and it?! attached to the upper part of the left end frame db by screws W3 and its. Three pins Mi l (Fig. la) equally spaced around the sideface of hub 98 and carried by the same engage in radial slots itl cut in three Bakelite segments itt. 'A groove on the outer edge of the segments tilt has therein a circular coiled radially contractible spring Hit which causes the members ltli to be frictionally engaged with a sleeve ill on a hub M2. Hub lit is fixed to shaft 99 by set screw H3 and rotates therewith. It can be seen from the above description that the gear at is frictionally attached'to the selector cam shaft W by means of the slip friction clutch. The selector cam shaft as will therefore tend to rotate with the gear j 'l by the action of the friction members tilt on the sleeve ill. A selector cam sleeve lid is attached to the shaft 991 to be rotated therewith by a pin lit. A selector cam shaft stop-arm H5 is securedto the shaft llfl for rotation therewith'by means of a clamping screw lit carried by said stop-arm. A pointer pin l Ilfl (Fig. 1) is located in the right end of the selector cam shaft 99 for rotation therewith and a radial scale Mill is etched on the bushing clamping member Hi2. This pointer ill) and scale tilt in conjunction with the adjustment of the stop-arm lit on the selector cam shaft 99 determines the elapsed time between the release of the selector cam shaft and the en-.

'56. Gear it also "h ll gagement of a cam and selector lever as will be hereinafter described.

It will be assumed being received on the printer selector magnet 36, (Figa'l) and therefore the armature 45 will 'be drawn toward the pole pieces will also be assumed that the motor M is continuously rotating and through the progressive geai' train comprising gears 84, 15, 16, 85, 94,

and 91, respectively, as shown in Figs. 4 and '7,

the selector cam shaft 99 is tending to rotate by communicated thereto through the'slip. friction clutch on said shaft 99. The selector cam shaft 99, (Fig. 7) is restrained 4 from rotation by the thereto the end of which is iengaged with a horizontal projection H1 on the armature lever .44.

This projection H1 on the armature lever 44 is 50 arranged that it will be in the path of the H5 when the armature 45 is pulled forward by lector magnet 36. 'Wh-en the magnet is not enthat a marking impulse is of the magnet. It-

stop arm H5 rigidly secured the energization of the seergized, the spring 53 pulls the armature lever 44 up and disengages the stop arm II5 and projection H1. The selector cam shaft 99 is thus with the gear 91 through the action therewith. Five of these cams II 8:: to Be are selector cams, the sixth, II8f, being a trip cam, the purpose of which will be described hereinafter.

Referring to Figs. 2, 3, 7 and 9, a selector unit mounting plate I I9 is secured in a vertical position Jecting horizontally from the right sideof the plate H9 have arranged thereon a plurality of selector lever guide plates I23 and spacers I24. Between the guide plates I23 are located five selector levers indicated in general at I (Fig. 9) and individually by reference characters I25a to I25e (Fig. 3). The spacers I24 are slightly wider than the selector levers I25 and therefore the selector levers are movable between the actuated positions, The springs attached to the selector levers are indicated in general at I26 and I2! (Fig. 9) and individually by reference characters I26a to I26e (Fig. 3),

I26e only being shown and The spacing start impulse which is current causes the release of \Fig. 7) and thus an interval of no the armature 45 ture lever 44 is no longer engaged with the stop arm II5, the selector cam shaft 99 therefore starts to rotate with the gear 97 through the action of the heretofore described friction clutch As described above, the receiving of into 20 to be selected, the 5 being spacing, the selector magnet therefore remains unoperated for the duration of this impulse. About the middle of the first impulse, while the spacing impulse is being rea hump on 30 cam disc II8a continues to rotate, this hump will rotate the selector lever I25a against the action of springs I26a and I2'Ia about the tip of a downwardly extending portion I35 of the mounting plate II9. As the selector cam shaft the action of springs I26a and I2'Ia. 43 The next impulse of the signal code being marking, the magnet 36 is therefore energized. This draws the armature 45 to its front stop and thus the front end I34 of the U-shaped armature lever 44 is lowered. About of the rearwardly extending arm of the second on the square pivot stud I32 by springs I26b and I21b in the same manner I25b comes in contact with the front end I34 7 end of the armature position.- The selector w lever is rotated still further about its top pivot (Fig. 9) which is continuously driven through movement of the selector lever H5!) is limited and adriven member or ratchet 'it normally tend- 15 l 65 into mechanical selections by means of the sele t d osition ".dependjng upon the re as placed by the marking impulses, the forks areas/ea th lever. projection its coming into contact with tive selector levers-being in their normal or upper the end of the armature lever thus stops the positions. as the character signal described was movement of the selector lever 52% in that dimade up of the first and third impulses spacing, rection and also its rotation about the end lit the first and third selector levers will,.therefore,

5 on the pivot stud 132. As the hump iiab on be in their upper or normal position. The sec- 5 the cam continues to rotate, the selector lever ond, fourth and fifth impulses being marking,

itiih pivots about the point where the projectheir respective selector levers will be in their tion its on the top thereof. comes in contact with lower or selected position. the end of the armature lever it. As the selector At the left end of the operating cam shaft 56,

point hy the cam ililb, the end H35 thereof slides gear it, is a positive action. or ratchet clutch. on? the pivot stud i352 and is pulled down by, As heretofore described, this clutch is composed spring with. Spring it'll) keeps the arm tilt of' two parts, a driving member or ratchet 63 against the pivot stud M52. The downward rigidly attached to the operating cam shaft 56 by the pins tilt and it'l upon which the arms ing to engage said driven member t3 by action of the selector lever rests, with the lever in its of spring it. The ratchets 63 and 113 are normally selected position. A selector lever is shown dotkept apart by the lower end of the operating cam ted in its selected position in Fig. 9. trip lever idi, (Fig. 12) acting upon a side cam no The third impulse o the s g al code being surface M2, (Fig. 'l) on the hub of the driven spacing, the third selector lever i250 will be left ratch t 113, (Fig, 9). The driven ratchet i3 is Po o ed in its normal position in the sam loosely keyed to the hub 68 of the operating cam manner as was the first selector lever ia. The assembly and can Slide along t axis of t op.- fourth a d fif pu being marking, crating cam shaft lit into and out of engagement Q5 fourth and fifth selector levers Mid and i25e ith t driving t t 53, t can only rotate 25 will be actuated to their selected positions in the t t perating cam s m, At c t in same manner as was the second selector lever point in t v l ti f th am sleev H4, i251). (Fig. 12) the hump M8 on the sixth cam engages T speed of th selector cam shaft and the 'r lever its and causes the lower end of lever 0 cams are so positioned that the various impulses to to be disengaged from the side cam urface are received on the selector magnet just before rep I Afterbeing tripped, t t lever MI the humps on the cam start to actuate their re r t e t it norma1 position by spring M3 spective selector levers. attached near the lower end thereof. The trip Ali a predetermined point in the revolution of lever Mil being tripped allows the driven ratchet the selector cam shaft or, a hump o the sixth to, (Figs. '1 and e) to slide along the axis of the Cam i W ages the top rear end of a l o operating cam shaft and into engagement with lever ltd, the front end of which is pivoted on t driving t t c3, T driven t t la a stud its which in turn is rigidly secured to the d th operating ca in ill th otate with selector unit inountlng plate its. The lower rear. the operating cam shaft '56. As the driven do end the v W8 Tests o the pp n of ratchet l3 nears the end oi one revolution, the 40 Operating Cam p lever (Fig- 312)- The p side cam surface M2 on the hub of the driven ating cam trip lever is pivoted on screw ldt which a ratchet iii engages the side of the lower end of is attached to the printer frame to. Thus in con-' the operating cam trip lever iii and as the j c o w h t sixth cam W a d the T e ratchet "it! rotates further it is cammed out of the Operating Cam p lever i W be engagement with the driven ratchet 63. A fur- 45 pp d onevery revolut n o t e s o m ther projection of the side cam surface engages shaft The D P 0 the p level" w the end or the operating cam trip lever it! and.

be described later. I stops the rotation of the driven ratchet at a cer- The five impulses which make up the character t m i t i the rotation thereof.

code having been received, the next impulse is Th operation or the operating a M will w 50 e p p This impulse is marking be described. The operating cam assembly is'so p se and s eceived on the elector ma ne at, arranged on the operatingcam shaft that the (Fig. 7) before the selector cam sh'aittt has made haft an rotate without the cam assembly, but

a complete revolution. The selector magnet 36 the cam assembly cannot move along the axis of 5c s m t y h marking impulse and therethe operating cam shaft. The operating cam ll re b n e projection m on t armature is rotated as previously described. The operating lever into the path or the selector cam shaft stop cam assembly is made up of an operating cam ll arm Md and when the stop arm reaches the pro- (Figs 9, 10 nd 11), a gathering cam M3 and a iection it w l be t p thereat: The selector selector lever reset cam M4, the latter two cams l on cam haft 99 is now positioned for the start imbeing rigidly tt t t front n rear sides pulse of the next character to be received in the Bespectively of t operating Cam '3 The perselector m n 'ating cam is a disc with a part M5 thereof shown e above descr ptlon Shows how the electrical dotted in Fig. 11, displaced to the front r the impulses which compose the Signal are changed printer along the axis of the operating cam shaft. The lower ends M6 of the selector levers i25 are lector magnet 36, the selector cams iifla to Mac maassociated equipment These mechanical bifurcated and the operating cam ii is so placed r in. relation to the selector levers H25 that when o esented b the selector levers, the

l eii sffheing' eitl i er in their normal or the Selector levers are m selectedposmon f the oped on th 1 t magnet for th respective on. the selector levers straddle the disc 0 s ec' r lever. The impulses'which are marking Grating cam ii; D e t y f10nt 0f e i ur- "are epresehtedby their respective selector levers sa ed ends of the se ec d levers and In Operative tang-inc sor er or selected position and the relation therewith are a series of five selecting ildspacing'impulses-hre represented by their respeccode disc levers indicated in general at M1, in

Fig. 9 and individually by reference characters I41a to I41e, in Fig. 2.

Each selector lever has an associated code disc of the selected selector levers, namely, the second fourth lever I25d and the fifth ward the front. The marking position of the code disc levers is to the front and the spacing position to the rear. Thus, the second, fourth and fifth code disc levers I41b, I41d and I41e to their disc as were the selected selector levers I25b, I25d and I25e.

The code disc spacing or markingpositlon corresponding to cam disc engages the bottom of the forks of the selected selector levers. Due to the shape of the reset cam I44 and its rotation with the operating cam, the selector levers are raised. When the arm I35 on the selector levers is high enough to clear the pivot stud I32, attached springs I21 selector levers I25 are ready for the next character code selection. Further rotation of the operating cam assembly is stopped after one comis engaged by the gathering cam I43 in the stop cam assembly. The

due to the quick stop of the cam assembly by the operating cam trip lever I M The latch I54 has a spring I51 attached to it which normally keeps the latch against the stop pin I58.

- The functions of the selector cam and of the operating cam assembly are so timed that there ship with the selector cam shaft 99.

Type-wheel stop mechanism The type-Wheel ing a type-wheel shaft sleeve I62 wheel shaft I63 and associated parts.

wheel shaft sleeve I62 is attached to wheel shaft I63 for rotation therewith by pin I 63. Attached to the bearing sleeve I6I by screws I64, only one of which is shown in Fig. 3.5, a rear stop member guide plate and a stop unit mounting plate F66. A. clamping Washer I61 between the plate I66 and. a stop merriber pivot disc I68 keeps said pivot disc against the rear guide plate I65. Screwed into the right face of the rear guide plate I65 are a series of four posts I69. On the right side of the flangeof sleeve IGI is a spring plate Ill and a series of spacers I12 and filler washers I13. Surrounding each filler washer are code discs indicated in general at I14 (Fig. 9) and individually by reference characters The spring plate I1i, spacers I12 and filler washers I13 are held fast and in position by a front stop member guide plate I15 attached to posts I69 by screws I16 in the right ends thereof. As the washers I 13 and a type- The code with V-shaped notches s eaves ill-ll out along their circumferential edge in a manner well known in the art.

As will appear from the following each disc has two positions. For each combination of settings of these discs corresponding. ii-shaped notches lid on each disc will be in alinement with each other. At right angles to and equally spaced around the circumference of the code discs and guided in radial slots ill and H8 in of an individual coil spring l8l attached'to it,

the other end of the spring being attached to the spring plate llll.- By the action of thesesprings the stop members W9 are "pulled radially inward and are urged into engagement with the V-shaped notches in the code. discs l'ltl.

As stated above for each setting of the code discs l'l l one of the stop members ill) will have six of the notches under it in the six discs in alinement and will accordingly be pulled by its attached spring into said notches, it being understood by those skilled in the art that the notches are so cut around the circumference of the discs l'ld that only one such alinement of notches can exist at a time. The five code discs lltia to lldc are in operative relation with the five code discs levers idle to idle respectively. Each code disc lever- Ml is provided on the 'front end thereof with a downwardly extending projection ltd, the end Hit of which, is rounded and projects into a U-shaped slot Hi l of its associated individually notched code disc l'lt, one such disc being provided for each of the five disc levers H ll. The discs I'M are so mounted in relation to the disc levers I ll that a transverse motion of the levers imparts a rotary motion to the code discs about the bearing sleeve lot.

The code discs remain as positioned by the code to increase the number of possible selections without addition ofahother impulse. case shift signals are employed, calledshift and unshift signals. These two signals, bymeans hereinafter described, control the movement of the code disc we: The notches on the code discs lite to tide are so arranged that for a predetermined code combination of settings two rows of notches therein are in alinement. Which one of the two stop members lit, associated with the alined notches will be operated toward the axis of the stop unit is determined by the position of the code disc ll ly, called the shift disc. In one po sition. of the shift disc lit those stop members associated with the unshift signals are selectable and in the other position the stop members as sociated with the shift signals are selectable. The selection .of the shift and unshift signalscause the stop members lllilc and M92; respec tively to be actuated toward theaxis of the stop in its other position. i

3 of its actuated positions. lowing the shift or unshift signal the shift disc unit. The disc ililf has no control of the selection of the stop members H911 and l lob (Fig. l6) as it is cut away beneath the stop members and therefore either'of these stop members is selectable for. either position of the shift disc.

Pivotally mounted on pin 5 in the top of the right stop member guide plate 5 is a shift disc lever M6; The lower end of the lever its is slotted and engages a pin 68! rigidly attached to the shift disc 574 Stop members 979a and M91), as shown in Fig. i6, have projections ltBa and i881) thereon which are engageable with the left and right sides respectively ofthe shift disc lever E86; Assume that the shift disc W6 is in its unshift position as. shown in Fig. 16. Now, when the alinement of the notches in'the code discs lilo. to lite are such as to allow the shift stop member: illib to move inward the projection M381) thereon will engage the right side of the shift disc'lever idli. The spring 518i attached to the stop member lldb actuating said stop member causes the shift leverldli to rotate-about its mounting point a few degrees. The shift lever in turn'causes the shift disc l'ldf to be rotated a few degrees in a counter-clockwise direction to a position corresponding to its shift position whereinafter thestop members lie associated with the shift signal are selectable. With the shift disc in its shift position a selection of the unshift stopmember lite will cause said disc to return to its uhshift position whereinafter. the stop members. associated with unshift signal are selectable. It will be noted, therefore, that with the shift disc l'ldf in one position a certain stop member is allowed to be moved toward the center in respdnse to a certain signal combination and a different stop member is allowed to be moved toward the center by the same signal combination when the shift disc is A shift disc detent lever l 89 (Fig. 9) pivotally mounted on one of the studs its is engageable with a detent roller till pivotallymounted upon a pin let in the shift disc lid A spring Hi2, one end of which is attached to the detent lever ltt and the other end to a spring clip it? keeps the end of the lever engaged with the detent rollor Hit. The purpose of the detent leverand associated parts is to keep the shift disc in either Thus on signals folis held in one of its two positions.

0n the left end of the type-wheel shaft sleeve ltd (Fig. a flanged gear hub lllfl is placed for independent rotation. Attached to the gear huh for rotation therewith by screws ltd is a gear A flanged hub, ltd having a square till opening, is mounted on the squaredend of the type-wheel shaft iiiliin abutting relation to the sleeve ltd. The hub its is heldon the shaft by the nut lid and washerqlll t and-rotates therewith. Gn the periphery of the hub list are placed is constructed to operate in substantially the some manner as? the friction clutch on the selec-- tor cajln shaft shown in l2. The gear lull (Fig. 4;), meshes with an idler gear lliii pivotally mounted by means of its attached hub on a pivot stud ltd secured in the frame Gear tilt in 

